Jet for fluid treatment of yarn



u 15, 1961 c. J. CORMIER ET AL 2,995,801

JET FOR FLUID TREATMENT OF YARN Filed April 24. 1959 CLAUDEJ CoRM/rgkarma/mi Ame/E I w/wy htates This invention relates to apparatus for theproduction of bulky yarns.

Continuous filament yarns are often passed through air jets to produceloops or convolutions along the individual filaments thereby increasingsubstantially the yarn bulk and covering power. The conventional nozzlesused for this treatment are easily threaded up in some cases, forexample when the yarn is on a stationary package or is moving atrelatively slow speed. The threading-up operation can then be carriedout easily with the help of the suction produced at the yarn inlet bythe air jet or even by conventional hooks and thread-up wires. However,where a yarn is moving fast, say several hundred feet per minute andwhere it cannot readily be slowed down or stopped, the conventionalnozzle is generally very difiicult to thread. This is particularly truewhere a continuous operation is desirable. Here extrusion cannot easilybe slowed down or stopped so the nozzle has to be threaded with the yarncoming fast from the extruding jets or spinnerettes.

Applicants development The applicants have now developed an apparatuswhich overcomes these problems. In a general sense, this apparatus is afluid nozzle which comprises a body having a yarn passage which isprovided with an access opening along its entire length in the axialdirection and an air passage leading to the yarn passage from an airconnection. A removable cover member is adapted to be brought intoregistering position with the body to close the opening in the yarnpassage for yarn treatment and to be removed to non-registering positionfor yarn thread- In one form of such device, the body is a block havingan elongated flat surface and the yarn passage or channel runs alongparallel to the fiat surface with its access opening in the axialdirection opening on to the surface. Preferably, the yarn channel ismore or less circular in cross-section, the feeding opening being on achord of the cross-section. The air passage extends through the block,from an air connection, to a junction with the yarn passage. A coverplate is placed on the flat surface to close the side opening in theyarn passage for the purpose of treating yarn, and is removed for thepurpose of feeding yarn into the passage.

An alternative form of device also employs a block similar to that justdescribed, but in this case it has an axial passage provided with a plughaving an axially extending yarn channel which can be brought intoregister with the opening in the block above the yarn passage or rotatedso that the yarn channel in the plug and the passage in the block do notregister but the yarn channel in the plug registers with the end of theair passage.

In another preferred form of the invention, the yarn passage accessopening, instead of extending to the surface of the block, extends to agroove inset in the surface of the block, preferably a dovetailedgroove, and a dovetailed tongue is provided to slide into the groove toclose the lateral opening in the yarn passage.

In still another form of device, the block is made in two registeringsections, part of the yarn passage being on each section so that whenthe sections are juxtaposed, an enclosed yarn passage is provided. Theair passage Patented Aug. 15,. 1961.

ice

does not extend to the edges of the sections of the block,v

but terminates short of the edges and extends laterally through the sideof one block to an air connection.

The invention has been described in general and it' will now be referredto more specifically by reference to the accompanying drawings whichshow preferred embodiments and in which FIGURE 1 is a schematicperspective view of a yarn bulking machine embodying a preferred form ofair nozzle according to the invention.

FIGURE 2 is a perspective view of one form of air nozzle of thisinvention with the body cut away to show the internal structure.

FIGURE 3 is a perspective view illustrating another form of air nozzleaccording to the invention.

FIGURE 4 is a perspective view of still another form of air nozzleaccording to the invention.

Referring to FIGURE 1, yarn I is delivered by a feed roll 2 to an airnozzle A. The nozzle is made up of a main member or elongated body 4provided with a tubular yarn passage 6 opening onto the surface ofnozzle A as at 7. A cover plate 5 is removably held in position byscrews and when in place serves to close the passage 6. A conduit 8supplies compressed air to the nozzle. The treated yarn passes through aguide 12 then around a roll 10 and finally is wound on the take-uppackage 11. The package 11 is driven by a constant linear speed typewinder which is not shown.

A preferred way of threading up the nozzle is as follows. The yarncoming from feed roll 2 is pulled away by appropriate means, forexample, an air ejector (not shown). The nozzle is then brought inposition with its cover plate 5 removed so that the yarn can be slippedin the passage 6 through the slot 7, then the cover plate 5 is replaced.Compressed air is then admitted to the nozzle to act on the yarn. Thetreated yarn is wrapped around roll 10 and tied to the winding package11.

FIGURE 2 shown an alternate form of nozzle according to the invention.It includes a body B having a tubular passage 13 for supplyingcompressed air and a larger cylindrical bore 14 that runs along theentire length of the body. A cylindrical member 15 fits within the bore14 tightly enough to prevent air from escaping between it and thecylindrical member 15 but still allows the cylindrical member 15 torotate. The member 15 has a longitudinal slot 16 which forms the yarnpassage when it faces the air inlet 13. The slot 16 may also bepositioned in line with slot 17 of the main body, by rotating the member15 through This makes for the yarn to he slipped in.

Another form of nozzle shown in FIGURE 3 has a tubular bore 19 forfeeding compressed air, a cylindrical passage 20 for passing the yarnand a dovetail groove 22 parallel to the yarn passage 20 and joining it.The groove 22 is normally occupied by a sliding tongue 23.

The nozzle of FIGURE 4 has a panel C having a compressed air sourcepassage 25 and a groove 26 which starts at the groove 27. The groove 26runs obliquely with respect to the axis of the panel C and meets groove27 which runs to the long axis of the panel C. A panel D has registeringgrooves 29, 30 on one of its surfaces '51 so that when the panels C andD are brought into registering contact the matching grooves form boththe tubular yarn passage and the tubular air passage.

The operation of the other forms of device will be evident from theirstructure in conjunction with the description of the operation of theinitial form above.

The parts of the device may be made from any convenient material, forexample, wood, plastic material or metal or combinations of the variousdifierent materials. with an air passage leading from an connection tosaid We claim: yarn passage. A fluid nozzle for treating yarns,comprising, an elongated body provided with a dove-tail shaped grooveex- References Cited the file of this P213311t tending from the surfacethereof and a narrower elon- 5 UNITED STATES PATENTS gated yarn passageforming an extension of said groove,

a dove-tailed tongue slidable in said groove to close the gioss 1g1- 2?F2 yarn passage off from said groove for yarn treatment and 2'938257Bauer 6 M 9 0 to expose it for yarn feeding, said body being providedauer 1960

